Basis of presentation and significant accounting policies (Tables)

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Schedule of amounts excluded from the calculation of diluted net loss per share

The amounts in the table below were excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect (in thousands):

	As of June 30,
	2016	2015
Outstanding stock options and restricted stock units	5,598	4,856
Total	5,598	4,856